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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9988ded868f7a7fcbb5744f209be52b874eb44e7d68a0d27e62207a9069dad9' 
  AND token = '017S3K+CL/otOwWk2Nq+auSPbDseIJJp7UcWe6ddX14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}